Siren



Feb. 11, 1930. l s 1,746,437

SIREN Filed June 1. 1925 PatentedFeb. 11, 1930 y i i I 1,746

UNITED STATES PATENT OFFICE I Application filed June 1, 1925. Serial No. 33,937.

This invention relates to a siren. such that when the circuit is closed through The general object of the invent-ion is to the leads 28 the motor 27 will drive the rotor provide a siren which can be intermittently 20 to actuate the siren. sounded for signaling purposes. The end of the cylindrical port-ion 14 is One of the specific objects of the invention shown as provided with a'closure cap 30 55 is to provide a siren having a casing with which may be secured in place by removable motive power for the siren arranged within fastening members 31. The motor may be the siren and also having means within the held within the cylindrical portion 14 in any case for causing intermittent opening and desired manner.

closing of the siren horn. Within the member of the cover 12, I 60 Other objects of the invention will be apmount an electromagnet or solenoid 35. The

parent from the following descriptiontahen coil of this solenoid has leads 36 which may in connection with the accompanying drawextend to a switch and to a suitable source of ings wherein Fig. 1 is a side elevation of my power (not shown). The solenoid 35 is improved siren; Fig. 2 is a front view there shown as provided with a movable core 37 65 of; Fig. 3 is a central sectional view through which slides inthe hollow portion. of the 1 the siren showing the operating parts; Fig. 4 solenoid. This solenoid is supported on apis a front view of the siren with the cover reertured discs 40 which are secured by screws moved; Fig. 5 is a detailed elevation of the 41 fastened to the wall of the port member 0 front of the siren with the closure removed; 15 or in any other desiredmanner. The discs 70 Fig. 6 is a fragmentary elevation showing 4:0 are apertured to allow the air to pass the horn with the closure therefor in eXtendtherethrough. ed position; Fig. 7 is a central sectional view The core 37 is extended as at 4:2 and upon of a modified form of closure and Fig, 8 is an the extended portion a shoulder 43 is ati end view partly broken away showing the ranged. This shoulder 13 is engaged by a 75 p 4; produce a loud noise. made of iron or magnetic material so that modified closure. spring 44 which engages a washer on the disc Referring to the drawing by reference 40 so that the core 37 is normally moved to the characters, I have shown a siren as a whole right in Fig. 3. Upon the end of the core 37, at 10. This siren comprises a casing includ- I mount an imperforate closure 45. This ing a body part 11 and a cover 12. The case closure 45 may be a thin disc of metal and the g is preferably in the form of a hollow cylinder relation of parts is such that the spring 44: having a cylindrical portion 14 of reduced will pull this closure 45 into tight engagediameter projecting therefrom. The cover ment with the end of the member lso that 12 is provided with a port member 15 thereon. normally the member is closed andno sound 35. The cover may be secured to the casing by will pass thereform. When the motor 27 is as fastening members 16 as shown. operated and the circuit is closed through Mounted within the body 11 is a rotor 20. the leads 36 the solenoid will act against a This rotor includes the partition forming the spring it and will compress this spring i'nembers 21 having passageways 22 leading moving the core 37 to the left in Fig. 3 and to the separate chambers formed by the parallowing the air to pass through the port so titions. The outer wall of the body 11 is promember.

vided. with slot-s 25 therein and the construcj The core 37 it will be noted by referring tion is such that when the rotor 20 is rotated to Fig. 3 is composed of two parts screw the air will be forced through the siren to threaded together. The part at the right is The rotor is shown as provided with a shaft the coils of the solenoid 'will affect it, while 26. This shaft is indicated as apart of the the core at the left is preferably made of armature shaft of a motor 27 from which aluminum or other nonmagnetic material so leads 28 extend to a suitable switch and source that the efiiciency of the solenoid will not be 5c;- of power (not shown). The construction is impaired. 10o

In Fig. 7 I show a modified form of closure from the walls thereof to allow air to pass wherein the core 37 is fitted within a horn 15 through the port member. in the manner previously described. The In testimony whereof, I hereunto aifix my outer end of the horn is shown as provided signature. with a closure 50 which is fastened in place by LESTER H. MILE S.

suitable fastening members 51. This closure 50 is provided with apertures 52 therein and the end of the horn is provided with a rabbeted portion 53 in which a rotatable closure disc 54 is fitted. This closure disc 54 is pro- 75 vided with apertures 55 corresponding in shape to the apertures 50 so that when the disc 54 is rotated the apertures will align. To bring about rotation of the closure 54; I show this closure as provided with a tongue 50 60 thereon. This tongue fits in a spiral groove 61 shown as arranged in the outer periphery of the outer end of the core 37. This core 37 has a key way 62 thereon which engages a key 63 to prevent rotation of a core 85 when it reciprocates. The action of this modification is in all respects similar to the action of the closure previously described, except that instead of moving the closure bodily outward, in the modified form, I bring on about rotation of the closure to cause alignment of the apertures.

From the foregoing description it will be apparent that I have provided an improved 80 siren which can be operated for signaling 95 purposes and which can be economically manufactured and which is highly efiicient in use.

Having thus described my invention, I claim: 1

1. In a siren, a body part including a cylindrical portion, a rotor mounted within said cylindrical portion, said body portion being extended to form a hollow chamber, a motor mounted in said chamber, means whereby 105 said motor will drive said rotor, a cover for the chamber, means to secure said cover to said chamber. a pair of leads from said motor, a cover for the body, a port member on said cover, a closure for said member and means 110 to move said closure from closed to open position, said last mentioned means including a solenoid arranged within said member, means to space said solenoid from the Walls of said member, said solenoid having a core therein, 115

means to connect said core with said closure, resilient means for normally holding said closure in closed position, and apair of leads from said solenoid. 120

2. In a siren, a body part, a rotor mounted in said body part, means to drive said rotor, a port member on said body, a closure for con trolling the passageway through said memher, said closure having a stem thereon said 125 stem being mounted for sliding movement, and means associated with said stem to move said closure from open to closed position, and vice versa, said means including a solenoid located within the port member and spaced 

